centralize side effects ops as node method (#15188)
Summary:
A number of different passes rely on whether a node has side effects. This centralizes the list of side effectful ops in one place.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15188
Differential Revision: D13508438
Pulled By: eellison
fbshipit-source-id: 2143e782b787731ce007b6dcd50cbde30e1b8dd0
